Nov 20

Exchange 2010 OWA and OCS integration

Today I’ve configured the integration between OCS 2007 and Exchange 2010 RTM. There are a few differences between the RTM and Beta version… mostly the web.config parameters ;-)

Read it and enjoy the nice integration

Step 1: Copy OCS 2007 R2 Web Service Provider Files
Download the MSI at:
1)      CWAOWASSPMain.msi
2)      Extract it to C:\somewhere
3)      Go to C:\somewhere and install

  1. vcredist_x64.exe
  2. UcmaRedist.msi
  3. From an administrative command prompt, install CWAOWASSP.msi       

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Nov 19

OCS & Domain Controller versions

With the two versions of OCS (2007 and 2007 R2), and LCS 2005 SP1, there are requirements regarding the Operating System of the Domain Controllers.

These requirements are:

Operating system Office Communications Server 2007 R2 Office Communications Server 2007 Live Communications Server 2005 with SP1
Windows Server 2000 with at least SP 4 No Yes Yes
Windows Server 2003 with at least SP1 Yes Yes Yes
Windows Server 2003 R2 Yes Yes Yes
Windows Server 2008 Yes Yes No
Windows Server 2008 R2 No No No

What it basically means is that you can’t install OCS on if you only have Windows 2008 R2 domain controllers.

And installing OCS on Windows 2008 R2? There are posts in the social forums that stated that the installation didn’t work on Windows Server 2008 R2.

Anyway: You will loose official Microsoft support.


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Nov 18

OCS Server license model

Microsoft has changed its’ server license model regarding OCS for a while now, but I’m still searching the license model from time to time….

Therefore, I decided to put it on my blog.

Here is a picture stating the licensesOCSServerLicenseModel

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Nov 17

Frontend Server Validation fails on Federation

Running a validation on the Frontend server (Standard or Enterprise edition show a similar error message:

DNS Resolution succeeded: InternalIP
TLS connect succeeded: InternalIP:5061
Routing trust check and MTLS connectivity: Received a failure SIP response
Routing trust check and MTLS connectivity: MTLS connection establishment succeeded but received a SIP
failure response. This usually indicates lack of routing trust between the remote
server and the current machine. Check the local and remote server certificates for any
misconfiguration. In addition, check whether the local server is recognized
as a trusted server by the remote server.

Suggested Resolution: Routing trust check and/or MTLS connection establishment failed.
This is usually caused by the remote server not accepting the certificate presented by the
current machine. Check the local and remote server certificates for any
misconfiguration. In addition, check whether the local server is recognized
as a trusted server by the remote server.

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Nov 16

GroupChat file upload error

File transfer problems in OCS 2007 R2 Group Chat

After installing the Group Chat component from Office Communications Server 2007 R2, you may encounter the following error while attempting to upload or download files while joined to a chat room (see screenshot):


A file transfer error occurred.  Server was unable to process request. —> Object reference not set to an instance of an object.
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Nov 09

Response Group Service starting and stopping

In OCS 2007 R2, there is a new feature called Response Group Service.

OCS 2007 R2 Response Group Service enables administrators to create and configure one or more small response groups for the purpose of routing and queuing incoming phone calls to one or more designated agents. These response groups can be deployed in departmental or workgroup environments and in entirely new telephony installations.

Typical usage scenarios include an internal help desk, customer service desk, or general external call handler. Response Group Service can increase response group usage and reduce the associated overhead by pushing the tasks of response group maintenance down to the users who directly benefit from them.

For more info, see

If you are getting the following error:

There was a problem validating certificate: Identity check failed for outgoing message. The expected DNS identity of the remote endpoint was ” but the remote endpoint provided DNS claim ‘sipinternal.<SIPDOMAIN>’. If this is a legitimate remote endpoint, you can fix the problem by explicitly specifying DNS identity ” as the Identity property of EndpointAddress when creating channel proxy.

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Nov 03

CU3 Update – Updated ;-)

Microsoft has fixed in CU3 a problem some customers have encountered with CU2 in Address Book download where some lockup occured. This is resolved in OC 2007 R2 CU3.

Second, Microsoft has just released a brand new capability: the Cumulative Server Update Installer for OCS 2007 R2 is now available on the Microsoft download center. All the information needed to install this package is in the KB 968802-

This is a  single package which can seamlessly install the required patches on all the OCS 2007 R2 server roles. The process for updating R2 had gotten a bit complex (requiring applying the patches in specific order, etc) and this will make it much simpler. Microsoft has bundled the various OCS 2007 R2 server role patches into this single Update Installer.

Note: the server update installer does not install Group Chat patches, Office Communicator 2007 R2.

Also the server update installer does not install the Database upgrade OCS2009-DBUpgrade.msi (in particular the one from QFE2/CU2, which is required for Cumulative Updates from CU2 and up).

Here are the instructions on how to install the Server patches (as also explained in the KB).
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Nov 02

OCS updates – October 2009

October update for OCS 2007 R2 Server, OC 2007 R2 and Office Communicator Phone Edition R2 has been signed off earlier this week. The KB articles are being published and should be available on in very short order. The OC 2007 R2 patch is available here –

The update to OC 2007 R2 will also be available from Microsoft Update in November. The server updates will be on Microsoft Update as well but due to these updates having a dependency on the CU2 update (July update) for Back End, they will only be visible if CU2 has been installed.

Main KB references:
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Oct 28

FIX for KB974571

The hotfix of Microsoft that came with a ‘feature’ regarding LCS and OCS has been updated…
The feature made the OCS environment think that the trial period was ended… No matter if you had the real product installed….

Microsoft has released a hotfix that will be available for download using Windows Update shortly.

If you want to download it first… here is the URL:

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Oct 27

OCS MCM; Great benefit!!

Does it take you hours and hours to build testcases, validate configurations etc etc….

Here is a great post I found:

According to the visionaries the future is ‘all in the cloud man!’. Well, not to be out done we have just launched a new set of online labs for the exclusive use of certified OCS MCMs. These 4 new lab environments are based on the core labs that we use for the program but also include a second set of labs based on a co-existence and migration scenario that the candidates have to work through in class. This gives certified OCS Masters 7×24 access to a full set of enterprise grade environments where they can test out scenarios, validate designs, reproduce issues, practice upgrades etc etc…We even have the ability to join two of the labs together to behave as two separate enterprises each with their own edge infrastructures, PSTN ranges and private networks. Comprehensive stuff and a great addition to the benefits of becoming a certified OCS Master.

Source: The Mast Blog

So another great reason to become OCS MCM.
Want to find more infor regarding OCS Microsoft Certified Master Program? Look here

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